Re: GGI Project Unhappy On Linux

H. Peter Anvin (hpa@transmeta.com)
28 Mar 1998 10:29:01 GMT

Followup to: <Pine.LNX.3.95.980328101434.19294B-100000@ferret.lmh.ox.ac.uk>
By author: Matthew Kirkwood <weejock@ferret.lmh.ox.ac.uk>
In newsgroup: linux.dev.kernel
> >
> > > A process running at ring 0 can still disable interrupts, DMA into
> > > kernel memory, etc...
> >
> > But the Xserver isn't running in the kernel mode.
>
> I may have missed something, but the difference between iopl 3 and "kernel
> mode" is...?
>

Huge. IOPL 3 is just user mode with full access to the hardware, but
not, for example, to kernel memory.

-hpa

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